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问题: 关于time

It's about time the governmen______proper steps to solve the traffic problems/
A to take
B took
C takes
D taking
答案是B。
It's 是现在时,took是过去时,为什么可以这样?

解答:

因为It's about time (that) +..... 从句中用一般过去时
表示虚拟语气 和现在的虚拟 -----该是....的时候了

It is the time that we went to bed